Final answer:
Near a low-pressure system, you would typically notice thick cloud cover that suggests the possibility of stormy weather, as the rising moist air forms clouds.
Step-by-step explanation:
When observing cloud cover near a low-pressure system, you would typically notice thick cloud cover, suggesting the possibility of storms. Low-pressure systems are associated with rising moist air, which condenses to form clouds and can lead to precipitation and various weather events. This rising air can create instability in the atmosphere, often resulting in stormy weather conditions. Therefore, the appropriate answer to the question of what one would notice about the cloud cover near a low-pressure system would be 'The cloud cover is thick, suggesting the possibility of storms' (option b).